The movie is set in 1977, but some of the cars have white headlights. French cars had yellow headlights and switched to white ones only in 1993. However Gerard Depardieu's car has the correct headlights.
Bacarra - Parlez Vous Francais, the song played when they enter the bar, came out in 1978, yet the movie is set in 1977.
A Renault 4 GTL is seen in the background. This version, with gray bumpers, was introduced in 1978, while the film is set in 1977.